Surface waves and wave resistance in magnetic fluids

J. Browaeys, R. Perzynski, J. C. Bacri, M. I. Shliomis

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We present here the experimental determination of the dispersion relation of surface waves of a ferrofluid submitted to a steady vertical magnetic field. The results are compared to a linear theory where all the magnetic characteristics of the fluid have been taken into account. The knowledge of the dispersion equation is then used to analyse the capillary-wave resistance, that is the drag force associated to the emission of waves by a moving disturbance at a free fluid surface. It undergoes a transition from zero to a finite value as the speed of the disturbance reaches a certain critical value. The effect of viscosity is explored, and a magnetic fluid is shown to allow controlling the critical speeds. Contrary to the theoretical model, however, the measured wave resistance reveals a non monotonic speed dependence after the threshold.

Original languageEnglish
Pages (from-to)446-455
Number of pages10
JournalBrazilian Journal of Physics
Volume31
Issue number3
DOIs
StatePublished - 1 Jan 2001

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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